Pr radar detecting an aircraft

Hi All,

I think I have the right answer for this, but I'm not that confident on these questions..

Three radar sets, operating independently, are set to tdetect any aircraft flying through a certain area. Each set has a probability of .02 of failing to detect a plane in its area. If an aircraft enters the area, what is the probability that ita goes undeteected?b is detected by all three radar sets?

is the probability that any of the three radars does not detect it.
The probability that none detect it, would be:
As this means: 1 does not detect AND 2 does not detect AND 3 does not detect. And you worked that one out already.